Subwoofer Central

Pick a standard size, or type any thickness.

Every panel is 19.1 mm unless you say otherwise here. Type a thickness to override one panel, or clear the box to put it back. Values are per sheet layer; the front value is multiplied by baffle layers.

Stock dimensions and kerf drive the nesting diagram and sheet yield.

Rank 1 laps over ranks 2 and 3.

Save the current box to reuse it with any driver, in this browser or as a file on your computer.

As a .json file you can keep, send or re-open:

No saved boxes yet.

Save the current driver to reuse it in any build. Stored locally in this browser. Load also accepts WinISD .wdr driver files.

No saved drivers yet.

Enter any sufficient set; every other parameter autofills as a derived value, and entries that disagree with the rest of the sheet are flagged. The SPL alignment is set by Fs, Qts, Vas, Sd, and Re. The Qes/Qms split and Le leave that alignment alone but do shape the impedance, excursion and max-SPL curves; the remaining motor parameters only cross-check the sheet.

Re and Le follow the voice-coil configuration in Driver wiring & load.

Per driver

1.60 Ω

Final load

1.60 Ω

Automatic layout uses the frame diameter. Manual percentages measure from the left and bottom edges while viewing the front baffle from outside; warnings flag overlaps and edge crossings.

1 port group. Each group can use its own shape, size, and firing face; one group is always required.

• Port group 1 · round · frontRemove port group 1

Thickness changes displaced volume, not the clear opening or acoustic length.

Round group centers are measured from the left and bottom edges while viewing each firing face from outside. Counted copies spread around that center. Leave a field blank to let the app place the opening clear of the driver; the greyed number is where it puts it.

Leave Qa or Qp blank to use the fill and port defaults.

Boundary loading of the space around the sub. Each nearby surface adds about 3 dB and they stack, so a wall-floor pair is about 6 dB and a corner about 9 dB; it shifts SPL level only, not tuning.